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If the ionization enthalpy and electron gain enthalpy of an element are 275 and 86 kcal mol^-1 respectively

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If the ionization enthalpy and electron gain enthalpy of an element are 275 and 86 kcal mol-1 respectively, then the electronegativity of the element on the Pauling scale is:

(a) 2.8

(b) 0.0

(c) 4.0

(d) 2.6

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Correct answer: (a) 2.8

Explanation:

I.E. + E.A. = 275 + 86 = 361 kcal mol-1

= 361 × 4.184 = 1510.42 kJ mol-1

∴ Electronegativity = \(\frac{1510.42}{540}\)

= 2.797 = 2.8

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